1 ,New 5V Relay Module

2 , can be used as microcontroller development board module can be used as home appliance control

3,5 V-12V to TTL control signal

4, the control signal DC or AC , 220V AC load can be controlled .

5, there is a normally open and one normally closed contact

6 , a power indicator light

7 , a control indicator , pull off, disconnect does not shine

8 , transistor drive to increase the relay coil control pins high impedance.

9 , the control pin has a pull-down circuit to prevent malfunction relay vacant